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Superior Cylinder AD and recall

The FAA has announced a new AD on Superior Cylinders. Superior informed the
FAA that they had omitted a critical heat treating step in the
manufacturing of the cylinders, and that there are 9 reports of cylinder
heads coming off of the cylinder barrels in the affected lot.

Excerpts from the AD's preliminary announcement are below. Basically if you
have the bad cylinders installed, you have to 150 hours TT on the cylinder
to remove them from service. If over 150, you have to ferry it to a repair
station.

==========================
2007-04-19 Superior Air Parts, Inc.

Unsafe Condition

(d) This AD results from the discovery of nine separated SAP
cylinder assemblies installed in TCM 470, 520, and 550 series
reciprocating engines and one separated SAP cylinder assembly
installed in LE 320, 360, and 540 series reciprocating engines. We
are issuing this AD to prevent cylinder separation that can lead to
engine failure, a possible engine compartment fire, and damage to
the airplane.

FAA's Determination and Requirements of This AD

The unsafe condition described previously is likely to exist or
develop on other TCM 470, 520, and 550; LE 320, 360, and 540; AL 540,
and SAP 360 series reciprocating engines of the same type design with
SAP cast cylinder assemblies that have as original equipment, or have
been overhauled or repaired using SAP part numbers listed in the table
above. For that reason, we are issuing this AD to prevent cylinder
separation which can lead to engine failure, a possible engine
compartment fire, and damage to the airplane. This AD requires removing
from service installed SAP cast cylinder assemblies listed in the table
above, no later than 150 hours total TIS to preclude cylinder head
fatigue failure and separation at the head-to-barrel threaded
interface.

ABOUT US

The Beech Aero Club (BAC) is the international type club for owners and pilots of the Beech Musketeer aircraft and its derivatives, the Sport, Super, Sundowner, Sierra, Duchess and Skipper aka Beech Aero Center aircraft.